[ntp:questions] Result of Earth Quake speeds up earth?
Hello, Firstly may I just say, my thoughts are with members of this list who are in Japan. Just a bit of an odd question... I hear in the Media that the earth quake sped the rotation of the earth up.. Can anyone confirm this? Does this mean that we will not need to 'insert leap seconds' for a while, or does it mean that we will need to retract leap seconds that have been added? ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] Result of Earth Quake speeds up earth?
Chris H wrote: Hello, Firstly may I just say, my thoughts are with members of this list who are in Japan. Just a bit of an odd question... I hear in the Media that the earth quake sped the rotation of the earth up.. Can anyone confirm this? Does this mean that we will not need to 'insert leap seconds' for a while, or does it mean that we will need to retract leap seconds that have been added? Values published were in the +1.5us / day range. Wonder how they compute that value? Adjust earth rotational energy by the amount of energy released from the earthquake? Earth gains daylength by tidal palpations anyway. (~1.7ms/century ~= 46ns/day?) uwe ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] Result of Earth Quake speeds up earth?
I hear in the Media that the earth quake sped the rotation of the earth up.. Can anyone confirm this? The earth quake has accelerated Earth's spin, shortening the length of the day by 1.8 microseconds. Does this mean that we will not need to 'insert leap seconds' for a while, or does it mean that we will need to retract leap seconds that have been added? The value 1.8 us is very small, but it adds up every day. However, this sum is comparable to the leap second only after several centuries. Thus, such a change will be completely lost on the background of other influences. Karel Sandler ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] Result of Earth Quake speeds up earth?
uwe writes: Adjust earth rotational energy by the amount of energy released from the earthquake? A quake can't change the rotational energy (or angular momentum): where is the reaction force? What it can do is change the mass distribution slightly, decreasing the radius of gyration and therefor requiring the rate of rotation to increase to conserve momentum. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] Result of Earth Quake speeds up earth?
Karel Sandler wrote: I hear in the Media that the earth quake sped the rotation of the earth up.. Can anyone confirm this? The earth quake has accelerated Earth's spin, shortening the length of the day by 1.8 microseconds. Does this mean that we will not need to 'insert leap seconds' for a while, or does it mean that we will need to retract leap seconds that have been added? The value 1.8 us is very small, but it adds up every day. However, this sum is comparable to the leap second only after several centuries. Thus, such a change will be completely lost on the background of other influences. Right: 1-2 us/day means ~500 us/year, so a single additional leap second every 2000 years. Since we used to have leap seconds every 1.5 years, then didn't have any at all for several years, this latest change is indeed lost in the noise. Terje -- - Terje.Mathisen at tmsw.no almost all programming can be viewed as an exercise in caching ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] Result of Earth Quake speeds up earth?
On 2011-03-15, Chris H n...@archnetnz.com wrote: Hello, Firstly may I just say, my thoughts are with members of this list who are in Japan. Just a bit of an odd question... I hear in the Media that the earth quake sped the rotation of the earth up.. Can anyone confirm this? Does this mean that we will not need to 'insert leap seconds' for a while, or does it mean that we will need to retract leap seconds that have been added? What I recall is that it is 2us/day, which is say 800us/yr= 1s/millenium. Since leap seconds come at a rate of something like 1 leap second per 3-4 years, thus one less leap second per millenium is not going to make any noticable difference. Climate change will make a vastly greater change (the ice goes from the poles to water at the equator, slowing the earth's rotation). ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] GPX18x LVC 3.50 firmware - high serial delay problem workround
David J Taylor david-tay...@blueyonder.co.uk.invalid wrote in message news:ilc6um$4s8$1...@news.eternal-september.org... To me it should be common courtesy to reply as soon as possible, even if it's just an acknowledgement. You might learn more from a phone call Still no reply - but I've not had time to call them up yet and start making a noise. Do you have a copy of the old firmware - and is there any reason not to downgrade? ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
